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Author Topic: DAC guts stuff, etc.  (Read 11924 times)

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firev1

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Re: DAC guts stuff, etc.
« Reply #80 on: November 09, 2014, 05:07:32 AM »
The Master 7's(and their other DACs) routing comes across to me as a little neurotic though, power runs right below the boards with the trannys right beside all 3 boards.

Actually the slots are more to prevent interference by conductivity. You see it all the time in bench equipment and multimeters where the application is to isolate high voltage components from the rest of the board. Below is my Fluke 8060A, you can see a few slots which I reckon are where some of the high voltage components are since its located near to the AC/DC test switches. As my meter is not Cat rated, there are no slots at the inputs which you would normally see in a modern yellow Fluke.
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Thad E Ginathom

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Re: DAC guts stuff, etc.
« Reply #81 on: November 09, 2014, 05:30:44 PM »
Quote from: Clemmaster on November 08, 2014, 08:26:59 PM
Placing the clock in the center and a mirror design is more reassuring to me.

I'm glad you said that, because I thought it... and I have no clue about electronics or circuits.  p:8

The guy has real geek glasses and a a real geek hat, but that is probably not good judgement criteria.  :-[ Interesting to see here what more knowledgeable people have to say.
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Anaxilus

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Re: DAC guts stuff, etc.
« Reply #82 on: November 09, 2014, 06:08:49 PM »
Quote from: Thad E Ginathom on November 09, 2014, 05:30:44 PM
I'm glad you said that, because I thought it... and I have no clue about electronics or circuits.  p:8

The guy has real geek glasses and a a real geek hat, but that is probably not good judgement criteria.  :-[ Interesting to see here what more knowledgeable people have to say.


They are fitting a lot including dual mono, dual femto clocks and integrated dual balanced amp into a relatively small package.  Also bear in mind the price point it was offered at. 

I would have thought looking at the board it was obvious they were trying to cram as much as would fit into the space available.  Maybe I need to borrow your guy's Geek glasses.   :)) ;)
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Thad E Ginathom

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Re: DAC guts stuff, etc.
« Reply #83 on: November 10, 2014, 02:58:01 PM »
Hmmm... makes me think that both the glasses and the hat might be just very practical choices for the job!  facepalm
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uncola

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Re: DAC guts stuff, etc.
« Reply #84 on: November 17, 2014, 01:25:55 AM »
there's an english project to make an Integrated amplifier with dac and raspberry pi inside.. the designer goes into detail on his design choices and the internal components and how he programmed the dac..  it's pretty in depth

http://audioberry.com/hardware/junior-versatile-digital-integrated-amplifier/
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kothganesh

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Re: DAC guts stuff, etc.
« Reply #85 on: November 17, 2014, 09:14:27 AM »
Marv,

given your opinion on the Sabre sheen, how different is the implementation in the Geek Out devices such that they are liked in this forum?
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Hands

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Re: DAC guts stuff, etc.
« Reply #86 on: December 21, 2014, 11:52:32 PM »
Dunno if anyone cares, but since I mentioned it earlier, I thought I'd dump some of the new info Metrum released on their new DAC. It will indeed be based on the new "Transient" modules, no surprise, though I have no clue if they're still utilizing the same DAC chips as before or not in these modules. Those modules alone on paper had better specs than what Metrum had put out prior.

Metrum recently released info on the FPGA/DSP "forward correction module" they're using in the new DAC (probably software trimming that has been discussed?): http://www.transient-audio.nl/FPGA_module.html

Page on the new DAC itself: http://metrum-acoustics.com/PavaneEN.html
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Re: DAC guts stuff, etc.
« Reply #87 on: December 22, 2014, 12:07:25 AM »
What is the module "forwardly correcting"?
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Re: DAC guts stuff, etc.
« Reply #88 on: December 22, 2014, 12:29:36 AM »
Probably will remain unanswered like all the other things Metrum tries to keep a mystery (i.e. DAC chips, other chips used). Hopefully it's the software trimming stuff mentioned earlier, at the very least, assuming same chips are used.
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Re: DAC guts stuff, etc.
« Reply #89 on: December 22, 2014, 09:02:52 AM »
forward correction = changing the input code to achieve the correct output voltage = software trimming.

It involves characterising each channel/chip individually and 'figuring out' which input code is needed to obtain the correct output voltage.
This also works for linearizing signed magnitude.

It only takes a database and 2 clockpulses to implement.
The 'incoming' sample code is 'replaced' by a sample code that is closer to the desired value and you are done.
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